Year: 2015
Type: article
Abstract: We report on the structure and physical properties of the polycrystalline PdTe superconductor, which is synthesized by the solid state reaction route via the quartz vacuum encapsulation technique at 750 °C. The as synthesized compound is crystallized in hexagonal crystal structure with P63/mmc space group. Both transport and magnetic measurements showed that PdTe is a bulk superconductor below 4.5 K. Isothermal magnetization ( MH ) and magneto-transport ( R ( T ) H ) measurements provided the values of the lower ( H c1 ) and upper ( H c2 ) critical fields as 250 Oe and 1200 Oe respectively at 2 K, establishing that the compound is clearly a type-II superconductor. The coherence length ( ξ 0 ) and Ginzburg–Landau parameter ( κ ) are estimated from the experimentally determined upper and lower critical fields, and are 449 Å and 1.48 respectively. Thermodynamic heat capacity measurements under different magnetic fields, i.e. C p ( T ) H , showed a clear transition at 4.5 K ( T c ), which shifts gradually to lower temperatures with application of field. The values of Debye temperature ( Θ D ) and electronic specific heat coefficient ( γ ) obtained from C p ( T ) data are found to be 203 K and 6.01 mJ mol −1 K −2 . The observed specific heat jump ( ΔC / γT c ) is 1.33, thus suggesting a possible weak coupling case for the PdTe superconductor.
Authors: Brajesh Tiwari, Reena Goyal, Rajveer Jha, Ambesh Dixit, V P S Awana
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Award: G855794406
OpenAlex ID: W2313192576